US5309728A - Control apparatus for multiple unit air conditioning system - Google Patents

Control apparatus for multiple unit air conditioning system Download PDF

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US5309728A
US5309728A US08/047,361 US4736193A US5309728A US 5309728 A US5309728 A US 5309728A US 4736193 A US4736193 A US 4736193A US 5309728 A US5309728 A US 5309728A
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compressor
indoor
turned
indoor devices
signal
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US08/047,361
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Y. Byoung Chae
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1912—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can take more than two discrete values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/49—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring ensuring correct operation, e.g. by trial operation or configuration checks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/54—Control or safety arrangements characterised by user interfaces or communication using one central controller connected to several sub-controllers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/50—Control or safety arrangements characterised by user interfaces or communication
    • F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/88—Electrical aspects, e.g. circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
    • F24F3/06—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units
    • F24F3/065—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the arrangements for the supply of heat-exchange fluid for the subsequent treatment of primary air in the room units with a plurality of evaporators or condensers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
    • F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/021—Inverters therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2600/00—Control issues
    • F25B2600/25—Control of valves
    • F25B2600/2511—Evaporator distribution valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

Definitions

  • the present invention relates to a control apparatus for a multiple unit air conditioning system, and particularly to a control apparatus which first adjusts the pressure of refrigerant in a compressor in order to prevent the compressor from being subjected to high pressure and then rapidly initiates the next system operation by turning off the compressor after a predetermined delay interval from the time that the independent indoor devices are turned off.
  • an indoor air conditioning refrigerant cycle is designed as shown in FIG. 1.
  • An indoor device 1 is installed in a room of a building and is composed of an evaporator 3, an expansion valve 2 and a solenoid valve 4.
  • the evaporator 3 cools the air in the room by heat-exchanging the air by changing low temperature and low pressure liquid refrigerant into gas.
  • the expansion valve 2 changes the liquid refrigerant which is high in temperature and high in pressure into liquid refrigerant which is low in temperature and low in pressure.
  • the solenoid valve 4 opens or closes to control the flow of the liquid refrigerant that is sent to the indoor device 1 according to the control signal from a refrigerant control section.
  • Refrigerant distributor 5 distributes liquid refrigerant to the evaporators 3.
  • Compressor 6 receives low temperature and low pressure gas refrigerant from the evaporators 3 and compresses the gas refrigerant thereby heat-exchanging the heat produced by compressing the air around it which changes the gas refrigerant into a gas refrigerant with a high temperature and high pressure.
  • Pressure relief valve 8 at the outdoor device diverts the refrigerant from the inlet of the compressor 6 to a condenser 7 when the pressure of the refrigerant is higher than a predetermined pressure.
  • Bypass conduit 9 diverts the refrigerant to a high pressure refrigerant distributor 5 thereby balancing the pressure.
  • the compressor 6 is also simultaneously turned off. Accordingly, when all evaporators 3 in the indoor devices 1 are turned off, as shown in FIG. 1, the solenoid valves 4 of indoor devices 1 the refrigerant, so that the refrigerant in the outdoor device does not flow into the indoor devices 1. At this time, the refrigerant discharged from the compressor 6 reverses direction which causes the compressor 6 to become over-pressured. Because of the unbalanced pressure generated in the compressor 6, the compressor 6 becomes overloaded and the rotation shaft of the compressor 6 may cause the shaft to become unbalanced and disposed at an abnormal position where the compressor does not operate efficiently.
  • the operation of indoor devices are monitored by an operation sensing portion. After all the indoor devices are turned off, the compressor continues to operate for a length of time determined by the time constant delay portion and then it is turned off.
  • FIG. 1 is a block diagram showing a conventional refrigerating cycle
  • FIG. 2 is a block diagram of the control apparatus according to the present invention.
  • FIG. 3(a)-3(e) is a timing chart showing the signal applied to each part of the control apparatus according to the present invention.
  • FIG. 4 is a circuit diagram of the control apparatus according to the present invention.
  • FIG. 5 is a block diagram showing a refrigerating cycle in accordance with the present invention.
  • FIG. 2 is a block diagram showing the control apparatus of the multiple unit air conditioning system.
  • a transformer 10 transforms A.C. power to the predetermined D.C. voltage, and a voltage regulation portion 11 regulates the voltage output from the transformer 10.
  • An operation sensing portion 12 evaluates all indoor devices which are mounted in various rooms of a building or apartment . . . and then transmits a predetermined signal according to the result of the evaluation.
  • a time constant delay portion 13 receives the signal output from the operation sensing portion 12 and transmits the signal after the predetermined time delay.
  • a relay drive portion 14 receives the transmitted signal from the time constant delay portion 13 and operates the relay according to the transmitted signal, so that the compressor is turned on or off by the relay in the relay drive portion 14.
  • FIG. 2 In reference to FIG. 2, FIG. 3 and FIG. 4, the operation of the apparatus according to the present invention is described as follows:
  • a power (A.C. 220 V) is applied to the apparatus according to the present invention at time t1 as shown in FIG. 3 (a).
  • Transformer 10 transforms the A.C. power to the predetermined D.C. voltage and supplies the D.C. power to the voltage regulation portion 11.
  • the voltage output from the voltage regulation portion 11 is applied to each portion of the apparatus as shown in FIG. 4.
  • An operation sensing portion 12 is electrically connected to all the indoor devices and senses the operations of the indoor devices. As shown in FIG. 4, each of the connecting terminals T2-T5 of the operation sensing portion 12 are connected to each unit of the indoor devices 1. Thus, if power is supplied to the indoor devices 1, the power is also supplied to the operation sensing portion 12 through these connecting terminals T2-T5.
  • Each of the indoor devices 1 corresponds to photo-couplers PC1, PC2, PC3 and PC4.
  • the photo-transistor collectors are all connected to 12 V power through resistor R20, and the emitters are all connected to resistor R9.
  • the number of indoor devices actually used may be more or less than four.
  • the corresponding photo-transistor of the photo-coupler is turned on, so that power is supplied to resistor R9 through the device.
  • four indoor devices 1 and four photo-couplers PC1-PC4 are illustrated, but more indoor devices may be used by adding a corresponding number of photo-couplers to the system according to the present invention.
  • the operational amplifier IC3 compares the voltage supplied to the non-inverting+terminal with the voltage supplied to the inverting-terminal.
  • the voltage applied to the non-inverting+terminal is greater than the voltage applied to the inverting-terminal, so that the operational amplifier IC3 produces a high level voltage.
  • the voltage output from the operation amplifier IC3 is supplied to the base of transistor Q3 through resistor R17, so that transistor Q3 is turned on. Because the collector of the transistor Q3 is grounded, the current from the 12 V power source flows into the ground through relay RY1 and transistor Q3, so that the relay coil is activated. At this time, the relay switch is connected to terminal NO, so that the A.C. power (A.C. 220 V) is applied to the compressor 6. As a result, the compressor 6 is activated.
  • A.C. power A.C. 220 V
  • the photo-couplers PC1-PC4 are turned off so that the operation sensing portion 12 outputs a low level D.C. voltage. Accordingly, because the base of transistor Q1 is at a low voltage, transistor Q1 is turned off and transistor Q2 is turned on. At this time, the charging voltage of capacitor C6 is applied to the non-inverting+terminal of the operation amplifier IC3, and the voltage divided by resistors R15 and R16 is continuously applied to the inverting-terminal at time t4 as shown in FIG. 3 (C) voltage, so that the output of the operational amplifier IC3 is held until the charging voltage of capacitor C6 is completely discharged. Because the output of operational amplifier IC3 depends on the transistor Q1, the current passes through transistor Q1 and relay RY1 is then driven by the current.
  • the present invention was designed to add an operation sensing portion, time constant delay portion and relay drive portion to the outdoor device, whereby the compressor of the outdoor device is turned off after a determined length of time following the interruption of the indoor devices. Thereafter, it prevents the compressor from being reversely compressed in high pressure in the interruption of all the indoor devices and thereby from being overloaded.
  • the life of a compressor is extended. Further because the unbalanced pressure of a compressor is prevented without using a bypass conduit, the design of the refrigerating cycle is compact.

Abstract

The operation of indoor devices in a multiple unit air conditioning system are monitored by an operation sensing portion. After all the indoor devices are turned off, the compressor continues to operate for a length of time determined by the time constant delay portion and then is turned off. Once the solenoid valves 4 feeding refrigerant to the indoor heat exchangers 3 are closed, the continued operation of compressor 6 causes an over-pressure relief valve 8 to open. This equalizes the pressure difference between the suction line and the high pressure discharge line of the compressor and thereby allows for faster restarts than a conventional bypass line 9.

Description

This application is a continuation of application Ser. No. 07/824,541, filed Jan. 23, 1992, now abandoned.
BACKGROUND OF THE INVENTION
The present invention relates to a control apparatus for a multiple unit air conditioning system, and particularly to a control apparatus which first adjusts the pressure of refrigerant in a compressor in order to prevent the compressor from being subjected to high pressure and then rapidly initiates the next system operation by turning off the compressor after a predetermined delay interval from the time that the independent indoor devices are turned off.
Conventionally, an indoor air conditioning refrigerant cycle is designed as shown in FIG. 1. An indoor device 1 is installed in a room of a building and is composed of an evaporator 3, an expansion valve 2 and a solenoid valve 4. The evaporator 3 cools the air in the room by heat-exchanging the air by changing low temperature and low pressure liquid refrigerant into gas. The expansion valve 2 changes the liquid refrigerant which is high in temperature and high in pressure into liquid refrigerant which is low in temperature and low in pressure. The solenoid valve 4 opens or closes to control the flow of the liquid refrigerant that is sent to the indoor device 1 according to the control signal from a refrigerant control section. Refrigerant distributor 5 distributes liquid refrigerant to the evaporators 3. Compressor 6 receives low temperature and low pressure gas refrigerant from the evaporators 3 and compresses the gas refrigerant thereby heat-exchanging the heat produced by compressing the air around it which changes the gas refrigerant into a gas refrigerant with a high temperature and high pressure. Pressure relief valve 8 at the outdoor device diverts the refrigerant from the inlet of the compressor 6 to a condenser 7 when the pressure of the refrigerant is higher than a predetermined pressure. Bypass conduit 9 diverts the refrigerant to a high pressure refrigerant distributor 5 thereby balancing the pressure.
In the multiple unit air conditioning system which is designed as described above, if all evaporators 3 in the indoor devices 1 are turned off, the compressor 6 is also simultaneously turned off. Accordingly, when all evaporators 3 in the indoor devices 1 are turned off, as shown in FIG. 1, the solenoid valves 4 of indoor devices 1 the refrigerant, so that the refrigerant in the outdoor device does not flow into the indoor devices 1. At this time, the refrigerant discharged from the compressor 6 reverses direction which causes the compressor 6 to become over-pressured. Because of the unbalanced pressure generated in the compressor 6, the compressor 6 becomes overloaded and the rotation shaft of the compressor 6 may cause the shaft to become unbalanced and disposed at an abnormal position where the compressor does not operate efficiently. In a conventional apparatus, in order to solve this problem, the pressure balance is achieved by the bypass conduit 9 until the rotation shaft of the compressor 6 returns to the normal position. However, because the pressure balance cannot be achieved without the passage of some time, the conventional apparatus has the problem that it does not restart rapidly.
A typical example of the prior art is disclosed in Japanese Utility Model Laid-Open Sho 62-12446. This apparatus can change, at any time, the number of the connected units to a different arbitrarily determined number of units. However, it does not prevent the compressor from being overloaded when all units in the indoor device are turned off.
SUMMARY OF THE INVENTION
Accordingly, in order to solve the above-stated problem, the present invention was devised.
It is an object to provide a control apparatus which rapidly adjusts the pressure by turning off the compressor of the outdoor device after a predetermined time delay from the time that the indoor devices are turned off.
It is another object to provide a control apparatus which prevents a compressor from being reversely compressed in due to a surge in reversed pressure after all the indoor devices are turned off.
It is another object to provide a control apparatus which adjusts the pressure applied to a compressor without using a bypass conduit.
In order to achieve these objects, the operation of indoor devices are monitored by an operation sensing portion. After all the indoor devices are turned off, the compressor continues to operate for a length of time determined by the time constant delay portion and then it is turned off.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing a conventional refrigerating cycle;
FIG. 2 is a block diagram of the control apparatus according to the present invention;
FIG. 3(a)-3(e) is a timing chart showing the signal applied to each part of the control apparatus according to the present invention;
FIG. 4 is a circuit diagram of the control apparatus according to the present invention; and,
FIG. 5 is a block diagram showing a refrigerating cycle in accordance with the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
In reference to the drawings, the embodiment of the present invention is described as follows:
FIG. 2 is a block diagram showing the control apparatus of the multiple unit air conditioning system. A transformer 10 transforms A.C. power to the predetermined D.C. voltage, and a voltage regulation portion 11 regulates the voltage output from the transformer 10. An operation sensing portion 12 evaluates all indoor devices which are mounted in various rooms of a building or apartment . . . and then transmits a predetermined signal according to the result of the evaluation. A time constant delay portion 13 receives the signal output from the operation sensing portion 12 and transmits the signal after the predetermined time delay. A relay drive portion 14 receives the transmitted signal from the time constant delay portion 13 and operates the relay according to the transmitted signal, so that the compressor is turned on or off by the relay in the relay drive portion 14.
In reference to FIG. 2, FIG. 3 and FIG. 4, the operation of the apparatus according to the present invention is described as follows:
A power (A.C. 220 V) is applied to the apparatus according to the present invention at time t1 as shown in FIG. 3 (a). Transformer 10 transforms the A.C. power to the predetermined D.C. voltage and supplies the D.C. power to the voltage regulation portion 11. The voltage output from the voltage regulation portion 11 is applied to each portion of the apparatus as shown in FIG. 4. An operation sensing portion 12 is electrically connected to all the indoor devices and senses the operations of the indoor devices. As shown in FIG. 4, each of the connecting terminals T2-T5 of the operation sensing portion 12 are connected to each unit of the indoor devices 1. Thus, if power is supplied to the indoor devices 1, the power is also supplied to the operation sensing portion 12 through these connecting terminals T2-T5. For example, when the indoor device 1 connected to the connecting terminals T2 is operating, power is supplied to the connecting terminal T2. Accordingly, power is supplied to photo-coupler PC1 through resistor R1, and the photo-transistor of the photo-coupler PC1-is turned on. A12 V power is then supplied to resistor R9 through resistor R20 and the photo-transistor.
Each of the indoor devices 1 corresponds to photo-couplers PC1, PC2, PC3 and PC4. The photo-transistor collectors are all connected to 12 V power through resistor R20, and the emitters are all connected to resistor R9. Thus, if at least one of the indoor devices 1 is operating (Four indoor devices are drawn in FIG. 1. However, the number of indoor devices actually used may be more or less than four.) The corresponding photo-transistor of the photo-coupler is turned on, so that power is supplied to resistor R9 through the device. In the embodiment shown in FIG. 1 and FIG. 4, four indoor devices 1 and four photo-couplers PC1-PC4 are illustrated, but more indoor devices may be used by adding a corresponding number of photo-couplers to the system according to the present invention.
At time t2 in FIG. 3 (b), if power is supplied to any one of the indoor devices 1 and any one of the photo-couplers PC1-PC4 is activated as described above, the 12 V power will be supplied to the time constant delay portion 13 through the driven photo-coupler. Accordingly, in the time constant delay portion 13, 12 V power is supplied to the base of transistor Q1, so that transistor Q1 is turned on. At this time, because the collector of transistor Q1 is grounded, ground voltage is applied to the base of transistor Q2, so that transistor Q2 is turned off. At time t2 in FIG. 3 (d), 12 V power is applied to the non-inverting+terminal of the operational amplifier IC3 and one terminal of capacitor C6, both of which are connected to the collector of transistor Q2 through resistor R13. The voltage divided by resistors R15 and R16 is applied to the inverting-terminal of the operational amplifier IC3 at time t2 as shown in FIG. 3 (c).
Accordingly, the operational amplifier IC3 compares the voltage supplied to the non-inverting+terminal with the voltage supplied to the inverting-terminal. Thus, when any one of the indoor devices is in operation, the voltage applied to the non-inverting+terminal is greater than the voltage applied to the inverting-terminal, so that the operational amplifier IC3 produces a high level voltage. The voltage output from the operation amplifier IC3 is supplied to the base of transistor Q3 through resistor R17, so that transistor Q3 is turned on. Because the collector of the transistor Q3 is grounded, the current from the 12 V power source flows into the ground through relay RY1 and transistor Q3, so that the relay coil is activated. At this time, the relay switch is connected to terminal NO, so that the A.C. power (A.C. 220 V) is applied to the compressor 6. As a result, the compressor 6 is activated.
Also, when all of the indoor devices are turned off at time t4 as shown in FIG. 3 (b), the photo-couplers PC1-PC4 are turned off so that the operation sensing portion 12 outputs a low level D.C. voltage. Accordingly, because the base of transistor Q1 is at a low voltage, transistor Q1 is turned off and transistor Q2 is turned on. At this time, the charging voltage of capacitor C6 is applied to the non-inverting+terminal of the operation amplifier IC3, and the voltage divided by resistors R15 and R16 is continuously applied to the inverting-terminal at time t4 as shown in FIG. 3 (C) voltage, so that the output of the operational amplifier IC3 is held until the charging voltage of capacitor C6 is completely discharged. Because the output of operational amplifier IC3 depends on the transistor Q1, the current passes through transistor Q1 and relay RY1 is then driven by the current.
That is to say, until the voltage of the capacitor C6 becomes lower than the voltage divided by resistors R15 and R16, operational amplifier IC3 outputs the driving voltage to the relay drive portion 14, and relay RY1 is driven by the driving voltage, so that the compressor 6 is powered by A.C. power (for example, A.C. 220 V). As shown in FIG. 3 (e), the compressor 6 operates during the time T2. Then, the pressure between the compressor 6 and the indoor devices 1 is adjusted so that even if the indoor devices 1 are immediately turned on after having been turned off, the compressor 6 begins operating at once.
As described above, the present invention was designed to add an operation sensing portion, time constant delay portion and relay drive portion to the outdoor device, whereby the compressor of the outdoor device is turned off after a determined length of time following the interruption of the indoor devices. Thereafter, it prevents the compressor from being reversely compressed in high pressure in the interruption of all the indoor devices and thereby from being overloaded. Thus, the life of a compressor is extended. Further because the unbalanced pressure of a compressor is prevented without using a bypass conduit, the design of the refrigerating cycle is compact.

Claims (2)

What is claimed is:
1. An air conditioning system comprising:
an outdoor device having a compressor, a condenser, and a conduit leading from the condenser to the inlet of the compressor, said conduit having a valve being opened upon exceeding a predetermined pressure;
a plurality of indoor devices connected in parallel each other and operatively connected to said outdoor device, each indoor device having an evaporator and an expansion valve;
an operation sensing means, operatively connected to each of the indoor units, for sensing the operation state of the indoor devices and outputting an ON signal if at least one indoor device is in operation and outputting an OFF signal if all indoor devices are out of operation;
a delay means, operatively connected to the operation sensing means, for receiving the ON signal and the OFF signal from the operation sensing means and outputting the ON signal and the OFF signal after a predetermined delay; and,
a relay drive means, operatively connected to the delay means and the compressor of the outdoor device, for turning ON and OFF the compressor of the outdoor device according to the delayed ON/OFF signals of the delay means.
2. The air conditioning system according to claim 1, wherein said valve of said outdoor unit is opened by upon exceeding a predetermined pressure created by an operation of said relay means being delayed by said delay means.
US08/047,361 1991-01-30 1993-04-19 Control apparatus for multiple unit air conditioning system Expired - Fee Related US5309728A (en)

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US08/047,361 US5309728A (en) 1991-01-30 1993-04-19 Control apparatus for multiple unit air conditioning system

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KR2019910001354U KR950002921Y1 (en) 1991-01-30 1991-01-30 Controlling circuit of multi-air conditioner
KRP91-1354 1991-01-30
US82454192A 1992-01-23 1992-01-23
US08/047,361 US5309728A (en) 1991-01-30 1993-04-19 Control apparatus for multiple unit air conditioning system

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JP (1) JP2516808Y2 (en)
KR (1) KR950002921Y1 (en)
DE (1) DE4202600C2 (en)
FR (1) FR2672112B1 (en)

Cited By (15)

* Cited by examiner, † Cited by third party
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US5630323A (en) * 1994-07-15 1997-05-20 Sanyo Electric Co., Ltd. Refrigerating apparatus
US5950440A (en) * 1997-10-28 1999-09-14 Denso Corporation Vehicle air conditioner with compressor noise reduction control
US6038873A (en) * 1998-04-30 2000-03-21 Samsung Electronics Co., Ltd. Air conditioner capable of controlling an amount of bypassed refrigerant according to a temperature of circulating refrigerant
FR2795492A1 (en) * 1999-06-28 2000-12-29 Samsung Electronics Co Ltd Method of regulating minimum temperature of multiple type air-conditioner, has arrangement which prevents frost formation due to overcooling of area which already has low ambient temperature
US6418735B1 (en) * 2000-11-15 2002-07-16 Carrier Corporation High pressure regulation in transcritical vapor compression cycles
US6502413B2 (en) * 2001-04-02 2003-01-07 Carrier Corporation Combined expansion valve and fixed restriction system for refrigeration cycle
US6644048B2 (en) * 2001-06-29 2003-11-11 International Business Machines Corporation Method for shutting down a refrigerating unit
US20040148951A1 (en) * 2003-01-24 2004-08-05 Bristol Compressors, Inc, System and method for stepped capacity modulation in a refrigeration system
US20060130515A1 (en) * 2003-04-15 2006-06-22 Electrolux Home Products Corporation N.V. Refrigeration system and a method for operating such system
US20070113582A1 (en) * 2004-05-24 2007-05-24 Daikin Industries, Ltd. Branching pipe joint and an air conditioner provided therewith
US20100051229A1 (en) * 2008-08-27 2010-03-04 Lg Electronics Inc. Air conditioning system
US20110192181A1 (en) * 2010-02-08 2011-08-11 Yi Haeyen Refrigerant system
US20170082334A1 (en) * 2014-05-30 2017-03-23 Mitsubishi Electric Corporation Air-conditioning apparatus
CN109270862A (en) * 2018-10-01 2019-01-25 珠海格力电器股份有限公司 Apparatus control method, control device and the equipment using the control device
US20190056158A1 (en) * 2015-10-26 2019-02-21 Mitsubishi Electric Corporation Refrigerant distributor and air-conditioning apparatus using the same

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Cited By (19)

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US5630323A (en) * 1994-07-15 1997-05-20 Sanyo Electric Co., Ltd. Refrigerating apparatus
EP0692687A3 (en) * 1994-07-15 1998-03-18 Sanyo Electric Co. Ltd Refrigerating apparatus
US5950440A (en) * 1997-10-28 1999-09-14 Denso Corporation Vehicle air conditioner with compressor noise reduction control
US6038873A (en) * 1998-04-30 2000-03-21 Samsung Electronics Co., Ltd. Air conditioner capable of controlling an amount of bypassed refrigerant according to a temperature of circulating refrigerant
FR2795492A1 (en) * 1999-06-28 2000-12-29 Samsung Electronics Co Ltd Method of regulating minimum temperature of multiple type air-conditioner, has arrangement which prevents frost formation due to overcooling of area which already has low ambient temperature
US6418735B1 (en) * 2000-11-15 2002-07-16 Carrier Corporation High pressure regulation in transcritical vapor compression cycles
US6502413B2 (en) * 2001-04-02 2003-01-07 Carrier Corporation Combined expansion valve and fixed restriction system for refrigeration cycle
US6644048B2 (en) * 2001-06-29 2003-11-11 International Business Machines Corporation Method for shutting down a refrigerating unit
US20040148951A1 (en) * 2003-01-24 2004-08-05 Bristol Compressors, Inc, System and method for stepped capacity modulation in a refrigeration system
US20060130515A1 (en) * 2003-04-15 2006-06-22 Electrolux Home Products Corporation N.V. Refrigeration system and a method for operating such system
US20070113582A1 (en) * 2004-05-24 2007-05-24 Daikin Industries, Ltd. Branching pipe joint and an air conditioner provided therewith
US20100051229A1 (en) * 2008-08-27 2010-03-04 Lg Electronics Inc. Air conditioning system
US9127865B2 (en) * 2008-08-27 2015-09-08 Lg Electronics Inc. Air conditioning system including a bypass pipe
US20110192181A1 (en) * 2010-02-08 2011-08-11 Yi Haeyen Refrigerant system
US20170082334A1 (en) * 2014-05-30 2017-03-23 Mitsubishi Electric Corporation Air-conditioning apparatus
US10451324B2 (en) * 2014-05-30 2019-10-22 Mitsubishi Electric Corporation Air-conditioning apparatus
US20190056158A1 (en) * 2015-10-26 2019-02-21 Mitsubishi Electric Corporation Refrigerant distributor and air-conditioning apparatus using the same
US10712062B2 (en) * 2015-10-26 2020-07-14 Mitsubishi Electric Corporation Refrigerant distributor and air-conditioning apparatus using the same
CN109270862A (en) * 2018-10-01 2019-01-25 珠海格力电器股份有限公司 Apparatus control method, control device and the equipment using the control device

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JPH04113846U (en) 1992-10-06
KR920015376U (en) 1992-08-17
FR2672112B1 (en) 1997-12-05
FR2672112A1 (en) 1992-07-31
KR950002921Y1 (en) 1995-04-17
DE4202600C2 (en) 1994-07-07
DE4202600A1 (en) 1992-08-13
JP2516808Y2 (en) 1996-11-13

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